Grate bearer bar



July 9, 1,946. RGRAVES 2,403,857

AGRATL -BEARER BAR Filu April s, 1941 AT ORNEY Patented July 9, `l946Y PATENT -oI-Flpcrspi-i Graves, Yonkers, N. Y., assgnor to The Standard Stoker company,` Incorporated, New Y' f fYiljiQlfIrzY.; acorporation of Delaware 1 'My invention relates to furnace grates for v steam boilerfurnaces and particularly toV that type of grate in which removable grate sections are provided.

An object of my invention is to provide a novel l,

y, residing in the construction, combination and arrangement of parts, will be apparent, to those familiar with the art, from the following description when read in connection with the, accompanying drawing, in which l Fig. 1 is longitudinal vertical central section through a locomotive i'lrebox, in which the center grate bearer bar is formed as a part of a Stoker conduit; the Stoker and center grate bearer bar being shown in elevation Withrparts broken away and shown in section; l

Fig. 2 is a sectional `view taken on the line 2-2 of Fig. 1 with the grate trunnion removed. Fig. 3 is a sectional view Ltaken on the line 3-3 of Fig. 1;.and y Fig. 4 is a sectional View taken on the line 4-4 AofF'igl.. 7,..

The invention has been shown V'and describedl as applied to a locomotive rebox but it will be apparent to those familiar to the art, that the novel grate bearer bar construction is equally applicable to various types of marine fireboxes and other boiler reboxes;

In the drawing, a locomotive rebox of conventional form is designated by thenumeral 49 and it is defined by the hollow rear wall 5D, the hollow front wall 5I, hollow side walls (not shown), and the grate 53. The gratev53 comprises a plurality Applieationnprils,1941,seria1NQ.ss7.455

" ivv 5 claires., (cries-its) wardly beneath Athe reboxbackwall 5D into the lower portion of the iirebox below the level of thegrate 53. -An elbow shaped-upturned conduit 55 communicatesnrwith the'forward end of the conduit 54 andextends forwardly yand upwardly to apoint above theV levelof thegrate 53 and adjacentv the rebox vfronti-wall l5 l Suitable conveying mechanism, well knownin the art, carries the coal 'forwardly from theftender (not shown) to the conduit 54, through which conduit the coal is advanced by a screw conveyor 56. The

coal is forced through the conduit 55 and upon `emerging from the discharge end thereof is projected rearwardly across the firing table 58 onto the grate 53, by suitable means, as by a blast of nuid under pressure issuing from a jet head 51 of grate sections, indicated by the numerals 48 in Figure 4, provided with grate trunnions 68,;

permitting rocking movement of the-grate sections 48 by suitable means, not shown. A Stoker, representedgenerally by the numeral 52, delivers fuel to the rebox and scatters it over they grate 53. l

The Stoker includes a conduit 54 Vextending fordisposed at the upper forward end of the conduit 55. Y v

The stoker conduitf54 is provided Awith a superstructure 5,9v including a longitudinally extending horizontal plate spaced above the conduit 54 and joined with the .conduit proper bya plu- Y rality ofV spaced transversely extending webs 6I. Every other pair of webs 6l are joined by a pair of laterally spaced longitudinally extending Webs 62` that also join the plate 60 withv the conduit proper. l

The plate 60 is provided throughout its length with aplurality of equally spaced longitudinally elongated slots 63'opening into the pockets 64 formed by the transverse and longitudinal webs 6I and 62.` Trunnion bearing units 65 are providedY on theirfunder sides with the depending 'longitudinally elongated tongues 66 which are .arranged to be received in the pockets 64 when the trunnion bearing units 65 are seated on the plate 60. The walls 6|, 62 of the pockets 64 prevent any substantial longitudinal,` lateral and rotational movement of the trunnion bearing units 65. The trunnion bearing units 65 are pro- :vided in their upper surfacefwith thelaterallyy Yextending recessed bearings 61 in which are jourrnaled* the grate trunnions 68.

The elbow-shaped conduit 55, Which is sup# ported from the boiler, mud ring-63 by a bracket Y 16, is 'provided on each side with'a plurality of laterally extending Webs 1I. To the outer ends of vthe Webs 1l are secured, in any suitable manner,

longitudinally extending plates 12, to which in turn longitudinally extending brackets 13 are suitably secured. The brackets 13 are arranged with the plates Y'l2 to form longitudinally extending grooves innwhich the tongues 14 of the trunnion bearing units 15 are received. The trunnion bearfrom the intense heat of the rebox. The remov-VV able trunnion bearing units 55 and 'l5 are preferably made of cast iron, while the stoker conduit is preferably made of steel.

I claim:

l. As a new article of manufacture, a-cornbined stoker conduit and grate bearer bar 'frame comprising in an integral structure a tubular stoker conduit, a plate spaced from and extending lengthwise of said stoker conduit and ribs connecting said `plate and stoker conduit, said plate being formed with a plurality of Vslots spaced lengthwise of said plate.

2. The combination in a rebox, of a stoker conduit extending longitudinally thereof, a longitudinally extending horizontal plate spaced above and formed with said conduit, and a plurality of separable grate trunnion bearing members ysupported on said plate, said members being disposed in end to end abutting relation.'

3. The combination rin a rebox, of a stoker conduit extending longitudinally thereof, a longitudinally extending horizontal plate spaced above and formed With said conduit, said plate being formed with a plurality of slots spaced lengthwise of said plate, and separable grate trunnion bearing members having depending tongues arranged to be received in said slots upon seating said bearing members on said plate.-y

4. The combination in a rebox, of an integral Vcast steel stoker conduit and grate bearer bar frame extending longitudinally of the firebox and a plurality of separable cast iron grate trunnion Abearing members supported on said frame.

l5. kThe combination in a rebox, of a stoker conduit extending longitudinally thereof, a longitudinally extending horizontal plate spaced above and `formed Withsaid conduit, said plate being formed with a plurality .of slots spaced lengthwise of said plate, and separable grater trunnion bearing members having depending tongues arranged to be received in said slots upon seating said bearing members on said plate, each of said bearing members being provided in its upper surface with a transversely extending recess adapted to receive a grate bar trunnion.

f JOHN R. GRAVES. 

